Improvement in machines for shearing boiler-plates



vby a belt.

UNITED STATES PATENT OFFICE.,

JOHN MCGREGOR AND THOMAS MCGREGOR, OF DETROIT, MICHIGAN.

IMPROVEMENT IN MACHINES FOR SHIEARING BOILER-PLATES.

Specification forming part of Letters Patent No. 1180,6I4, dated August 1, 1876; application tiled May 3, 1876.

To all whom it may concern p Be it known that we, JOHN MGGREGOR and THOMAS MGGREGUR, of Detroit, in the county of Wayne and State of' Michigan, have invented an Improvement in Boiler-Plate Shears,of which the following is a specication:

The object we have in view is to so construct a shears designed for cutting boilerplate with a bevel on the edge, leaving the saine ready for calking, as to att'ord increased facilities for removing, replacing, sharpening, and adjusting the stationary shear-block with relation to the movable shear-blade, and also to so adjust the same as that the angle or bevel upon which the plate-edge is sheared may be changed to suit the character of the plate.

Figure l is a perspective view. Fig. 2 is a transverse vertical section at w x. Fig. 3 is a cross-section at y y. Fig. 4 is an enlarged cross-section at .z z.

In the drawing, A represents a bed-plate, having cast therewith two parallel standards, B B, inclined to overhang the cuttingpoint, as shown. C is a driving-shaft, journaled through bearings at the upper rear corners of the standards, provided with a heavy balancewheel at one end, and fast and loose pulleys D at the other end, so that it may be driven E is a counter-shaft, journaled through brackets at the front upper corners of the standards, and on it is sleeved a large .spur-wheel, F, which is slowly driven by a pinion, F', keyed on the shaft C.

rlhe counter-shaft may be set in motion by a pin-clutch box, Gr, sleeved thereon, with two pins, a a, sliding through holes in a collar, G1, keyed-on said shaft, to engage with studs projecting from the side of the adjacent spur-gear F. The sliding box G may be actuated by a lever, G2, pivoted on a bracket, G3, at the side ofthe standard, as shown. Any other form of clutch-box may, however, be used, if preferred.

H is a plunger, reciprocated between the standards in inclined ways, formed by a transverse web-plate, B1, between said standards, and a face-plate, B2, bolted to their front edges. The reciprocation of the plunger is effected by an eccentric, I, on the counter-shaft, through' Vtapped into the bed-plate.

an eccentric rod, I', pivoted to the head of said plunger, the lower end of which has a shear-blade, b, bolted to its face, which moves with a drawing cut past the beveled cuttingedge of a stationary shear-blade, o, bolted onto the upper side of a shear-block, d, lying on the front edge of the bed-plate, and to which it is secured by two tap-bolts, e, passing down through slots in said block and The slots allow the block to be adjusted with relation to the movable shear-blade, such adjustment being facilitated by two other bolts, e e', tapped through a langeplate, f, bolted onto the front end of the bed-plate, said bolts also serving to relieve the bolts efrom the backward thrust ot' the block in shearing. g are bolts tapped up through the recessed body of the bed-plate,A

to impinge upon the under side of the block d, whereby the latter (and its blade) can be tilted up more or less, to give the required angle or bevel of cut, which must be greater or more acute in thin plate than in thick, in order to calk properly. Similar bolts g are placed under the front edge of said block to tilt it in the opposite direction, but, not being in the same line as the others, are not seen .in the cross-sections, Figs. 2 and 4, and are not shown in elevation 'to avoid crowding the parts in said figures. h is a gage at the side ot' thestandard, to regulate the thickness or width of the strip to be sheared from lthe edge of the plate, and is adjusted by means ot' a screw, h', tapped through lugs on the bedplate, as shown, whereby the cut can be regulated without removing the sheet ot' plate being sheared.

Ve do not wish to be conined 4to the use of thel bolts g for changing the inclinations ot' the shear-block, as it is evident that a metal' wedge may be used under it to accomplish the purpose.

When the shear-block is in its normal position, lying dat on the bed-plate, the bevel will be the proper one for the ordinary or usual thickness ot'- boiler-plate, each sheet lying on it in a horizontal position but for other thicknesses the platesare shifted slightly out of the horizontal plane. trough in the bed-plate for the clippings to drop into.

i is a depression or What we claim as our invention is- 1. In a plateshears, substantially as described, the combination, With the horizontal 3. In a plate-shearing machine7 the combination of the inclined reciprocating knife, the adjustable stationary shear-block, the bolts for adjusting such block7 and the gage, all constructed and arranged substantially as described and shown.

JOHN Moenneon.

Trios.y Meenneon.

Witnesses:

H. F. EBERTS, H. S. SPRAGUE. 

